CN101293994A - Multi-component totally degradable polymer composite and its method preparation - Google Patents
Multi-component totally degradable polymer composite and its method preparation Download PDFInfo
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- CN101293994A CN101293994A CNA2007100543510A CN200710054351A CN101293994A CN 101293994 A CN101293994 A CN 101293994A CN A2007100543510 A CNA2007100543510 A CN A2007100543510A CN 200710054351 A CN200710054351 A CN 200710054351A CN 101293994 A CN101293994 A CN 101293994A
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Abstract
The invention relates to a multi-component completely-degraded polymer composite material and a preparation method thereof. The composite material is formed by melting and mixing a starch filling master batch as a filler and a degradable polymethyl aethylenumdialkyl carbonate polymer as a matrix. The starch filling master batch is made of pre-plasticized polyvinyl alcohol-coated starch, and the degradable polymethyl aethylenumdialkyl carbonate polymer is synthesized from carbon dioxide and propylene oxide. The invention utilizes the starch filling master batch made of pre-plasticized polyvinyl alcohol-coated starch to improve the interface effects between the starch filler and the matrix, thereby increasing the strength of the composite material. Additionally, both polyvinyl alcohol and starch have water-absorbing capability, thereby promoting and accelerating the degradation of polymethyl aethylenumdialkyl carbonate polymer. The composite material has high mechanical strength and modulus, and low cost. The starch and polymers as raw materials of the composite material can be degraded completely and are non-toxic and harmless. The composite material is completely degraded and environment-friendly.
Description
Technical field
The present invention relates to a kind ofly, simultaneously, also relate to a kind of preparation method of polymer composites of this multi-component totally degradable with the polymer composites of starch based filling master batch as the multi-component totally degradable of filler.
Background technology
At present, environmental issue has caused countries in the world attention more and more widely, and the researchist is being controlled rope about how solving the problem of " white pollution " that caused by nondegradable macromolecular material waste.Filler is one of important additives of plastics composite, and it can reduce cost, and can also improve some physics or the chemical property of plastics composite simultaneously.The kind of filler is a lot, because the difference of its The Nomenclature Composition and Structure of Complexes has different physics and chemical property, thereby has different filling effects.Plant amylum be a kind of cheap, wide material sources, can quick and complete biodegradable natural macromolecular material, get back to the Nature with the form of carbonic acid gas and water behind the starch degradation, be not have the natural reproducible material that pollutes fully.The seventies in 20th century, starch joins the matrix material of making starch/common plastics in the nondegradable common plastics with the form of filler, but this type of matrix material can not degrade under field conditions (factors) fully, still has serious " white pollution ".Pure starch plastic is considered to biodegradable material likely always, but pure starch plastic has fatal shortcoming: be easy to go mouldy, absorb water the low and easy-formation not of intensity.The macromolecular material of having researched and developed at present that can degrade fully is few, as poly(lactic acid), polycaprolactone, poly butyric ester etc., but costs an arm and a leg, and be 3～5 times of common plastics.
Summary of the invention
The object of the present invention is to provide a kind of polymer composites of multi-component totally degradable, when improving composite property, reduced the production cost of matrix material.
Simultaneously, the present invention also aims to provide a kind of preparation method of polymer composites of multi-component totally degradable,, enlarge the scope of application to simplify technology.
To achieve these goals, technical program of the present invention lies in adopting a kind of polymer composites of multi-component totally degradable, such matrix material with the starch based filling master batch as filler, with the degradable lined polymethyl ethylene carbonate polymer is matrix, melt blending makes, wherein, the shared weight percentage of starch based filling master batch is 10-90%, and the weight percentage of lined polymethyl ethylene carbonate polymer is 90-10%.
Described filler is to adopt in advance that the plastifying polyvinyl alcohol coats the starch based filling master batch that various starch are made, and the starch weight percentage is 70-80% in the starch based filling master batch, and the plasticised polyvinyl alcohol weight percentage is 20-30%.
The coating material of described starch based filling master batch is the plastifying polyvinyl alcohol, and the polyvinyl alcohol polymerization degree is 500-1700, and alcoholysis degree is 88%-99%.
Described matrix lined polymethyl ethylene carbonate polymer be by propylene oxide and carbonic acid gas alternating polymerization and product, its molecular-weight average is 20,000 to 200,000, its chemical structure is:
Simultaneously, technical program of the present invention also lies in adopting a kind of preparation method of polymer composites of multi-component totally degradable, adopted in advance the plastifying polyvinyl alcohol to coat various starch and make the starch based filling master batch; With the starch based filling master batch as filler, being matrix by carbonic acid gas and propylene oxide synthetic degradable lined polymethyl ethylene carbonate polymer, with the starch based filling master batch under 150-190 ℃ temperature, mixing time is 5-20 minute, melt blending makes; Wherein, the shared weight percentage of starch based filling master batch is 10-90%.
The coating material polyvinyl alcohol of described starch based filling master batch is handled through plasticising, and used softening agent can be a kind of or its arbitrary combination in glycerine, ethylene glycol, low polymerization degree polyoxyethylene glycol, tributyl citrate, the acetyl tributyl citrate butyl ester.
Described starch is a kind of or its arbitrary combination in tapioca (flour), W-Gum, wheat starch, potato starch, green starch, modified tapioca starch, modified corn starch, modification wheat starch, modification potato starch or the modification green starch.
The shared weight percentage of described starch based filling master batch is preferably 40-80%.
Described starch accounts for the 20-60% of matrix material gross weight.
Multi-component polymer composites is to adopt in advance the plastifying polyvinyl alcohol to coat various starch to make the starch based filling master batch because the present invention can degrade fully, with the starch based filling master batch as filler, to be matrix, make with starch based filling master batch melt blending by carbonic acid gas and propylene oxide synthetic degradable lined polymethyl ethylene carbonate polymer.The starch based filler is uniformly dispersed in polymeric matrix, and good with the interface combination of body material, is the key that obtains the good starch based matrix material of mechanical property.The present invention adopts plasticised polyvinyl alcohol to coat the starch based filling master batch that various starch make, because polyvinyl alcohol specific molecule structure, it can have interaction of hydrogen bond with starch and lined polymethyl ethylene carbonate, is to connect starch and the good bridge of matrix lined polymethyl ethylene carbonate.The lined polymethyl ethylene carbonate that the present invention adopts is a matrix, lined polymethyl ethylene carbonate is the complete alternative multipolymer of carbonic acid gas and propylene oxide, carbonic acid gas structure weight percentage in its backbone structure is 43%, is a kind of macromolecular material with applications well prospect; Coat various starch with high alcoholysis degree, high strength polyethylene alcohol and prepare the starch based filling master batch, solved scattering problem and the interface problem of starch in the matrix lined polymethyl ethylene carbonate, can obtain the good multicomponent composite materials of mechanical property.Utilization of the present invention can complete biodegradable plasticised polyvinyl alcohol coat degradable starch, prepare the starch based filling master batch, solve scattering problem and the interface problem of starch in the matrix lined polymethyl ethylene carbonate, obtained the good multicomponent composite materials of mechanical property.The starch based filling master batch is filled in the lined polymethyl ethylene carbonate resin,, has quickened the degradation property of multicomponent composite materials because the resin-coated polyvinyl alcohol and the starch of starch based filling master batch have water-absorbent and completely biodegradable.Employing of the present invention source is abundant, cheap starch is packing material, improves binding deficient between starch and the matrix resin with physical method, has reduced production cost.Preparation technology of the present invention is simple, use range is wide, and the net content of starch can be controlled in 20-60% in the product, has higher physical strength and modulus, the matrix material of gained finally can be degraded fully, is a kind of environmental protection matrix material of novel Sustainable development.
The cladding process of the starch based filling master batch among the present invention is meant: use mixing equipment commonly used in the plastic processing technology, plasticised polyvinyl alcohol and starch are pressed the proportioning melting mixing, the temperature of melting mixing is 150-190 ℃, mixing time is 5-20 minute, shred after mixing or granulation, the granularity of starch can be 100 mesh sieves.Coat the material plasticised polyvinyl alcohol and handle through plasticising in advance, used softening agent can be glycerine, ethylene glycol, low polymerization degree polyoxyethylene glycol, tributyl citrate, acetyl tributyl citrate butyl ester or above mixture etc.Coating the selected polyvinyl alcohol polymerization degree of material is 500～1700, alcoholysis degree is 88%～99%, coating in the polyvinyl alcohol that material can be above-mentioned different polymerization degree and alcoholysis degree one or more, for example can be that the industrial trade mark is 0588,0599,1588,1599,1788 and 1799 etc.
When the preparation matrix material, also can use coupling agent, lubricant, pigment, forming agent, whipping agent etc.
Embodiment
Embodiment 1
Being 20% softening agent with weight percentage---tributyl citrate and weight percentage are that 80% the polymerization degree is 1500, alcoholysis degree is that 88% polyvinyl alcohol joins in the melting mixing equipment together, at 170 ℃, mixing revolution 50-100rpm, mixing time 5min, the preparation plasticised polyvinyl alcohol;
The plasticised polyvinyl alcohol that makes is joined in the melting mixing equipment with tapioca (flour) by weight ratio as coating material, under 170 ℃ temperature, mixing revolution 50-100rpm, mixing time 10min, carry out melt blending and prepare various starch based filling master batchs, wherein coating the shared weight percentage of material is 20%, and the shared weight percentage of tapioca (flour) is 80%;
With the starch based filling master batch that makes and molecular weight is that 40000 lined polymethyl ethylene carbonate is after super mixer mixes, wherein, the shared weight percentage of starch based filling master batch is 20%, the shared weight percentage of lined polymethyl ethylene carbonate is 80%, join in the melting mixing equipment in above ratio, at 170 ℃, mixing revolution 60rpm, mixing time 10min carries out melt blending and prepares degradable composite material.Wherein the methyl ethylene carbonate polymkeric substance be by propylene oxide and carbonic acid gas alternating polymerization and product.
The matrix material of gained compression molding instrument compressing tablet, Mechanics Performance Testing is carried out in standard sample preparation by ISO 527-2, the physical strength of multicomponent composite materials and modulus are greatly improved than body material lined polymethyl ethylene carbonate when hanging down loading level as can be seen from Table 1, can satisfy the performance requriements of various lives such as disposable tableware, non-returnable container material and industrial or agricultural disposable product, applied range.
Embodiment 2
Being 20% softening agent with weight percentage---acetyl tributyl citrate butyl ester and weight percentage are that 80% the polymerization degree is 1700, alcoholysis degree is that 88% polyvinyl alcohol joins in the melting mixing equipment together, at 170 ℃, mixing revolution 50-100rpm, mixing time 5min, the preparation plasticised polyvinyl alcohol;
The plasticised polyvinyl alcohol that makes is joined in the melting mixing equipment with tapioca (flour) by weight ratio as coating material, under 170 ℃ temperature, mixing revolution 50-100rpm, mixing time 10min, carry out melt blending and prepare various starch based filling master batchs, wherein coating the shared weight percentage of material is 20%, and the shared weight percentage of tapioca (flour) is 80%;
With the starch based filling master batch that makes and molecular weight is that 56000 lined polymethyl ethylene carbonate is after super mixer mixes, wherein, the shared weight percentage of starch based filling master batch is 40%, the shared weight percentage of lined polymethyl ethylene carbonate is 60%, join in the melting mixing equipment in above ratio, at 150 ℃, mixing revolution 60rpm, mixing time 20min carries out melt blending and prepares degradable composite material.
Embodiment 3
Be 20% softening agent with weight percentage---ethylene glycol and weight percentage be 80% polyvinyl alcohol (wherein, polyvinyl alcohol is by the polymerization degree 500 that accounts for weight percentage 20%, the polyvinyl alcohol 0599 of alcoholysis degree 99% and 80% the polymerization degree 1700, the polyvinyl alcohol 1799 of alcoholysis degree 99% is formed) join together in the melting mixing equipment, at 175 ℃, mixing revolution 80rpm, mixing time 8min, preparation plasticised polyvinyl alcohol;
The plasticised polyvinyl alcohol that makes is joined in the melting mixing equipment with W-Gum by weight ratio as coating material, under 170 ℃ temperature, mixing revolution 50-100rpm, mixing time 10min, carry out melt blending and prepare various starch based filling master batchs, wherein coating the shared weight percentage of material is 20%, and the shared weight percentage of W-Gum is 80%;
With the starch based filling master batch that makes and molecular weight is that 90000 lined polymethyl ethylene carbonate is after super mixer mixes, wherein, the shared weight percentage of starch based filling master batch is 40%, the shared weight percentage of lined polymethyl ethylene carbonate is 60%, join in the melting mixing equipment in above ratio, at 170 ℃, mixing revolution 70rpm, mixing time 8min carries out melt blending and prepares degradable composite material.
Embodiment 4
Be 20% softening agent with weight percentage---ethylene glycol and weight percentage be 80% polyvinyl alcohol (wherein, polyvinyl alcohol is by the polymerization degree 500 that accounts for weight percentage 20%, the polyvinyl alcohol 0599 of alcoholysis degree 99% and 80% the polymerization degree 1700, the polyvinyl alcohol 1799 of alcoholysis degree 99% is formed) join together in the melting mixing equipment, at 180 ℃, mixing revolution 100rpm, mixing time 15min, preparation plasticised polyvinyl alcohol;
Is that 50% tapioca (flour) and weight percentage are that 50% W-Gum joins in the melting mixing equipment by weight ratio with the plasticised polyvinyl alcohol that makes as coating material and weight percentage, under 170 ℃ temperature, mixing revolution 50-100rpm, mixing time 10min, carry out melt blending and prepare various starch based filling master batchs, wherein coating the shared weight percentage of material is 20%, and the shared weight percentage of W-Gum is 80%;
With the starch based filling master batch that makes and molecular weight is that 56000 lined polymethyl ethylene carbonate is after super mixer mixes, wherein, the shared weight percentage of starch based filling master batch is 90%, the shared weight percentage of lined polymethyl ethylene carbonate is 10%, join in the melting mixing equipment in above ratio, at 190 ℃, mixing revolution 70rpm, mixing time 5min carries out melt blending and prepares degradable composite material.
Embodiment 5
Be 20% softening agent with weight percentage---glycerine and weight percentage be 80% polyvinyl alcohol (wherein, polyvinyl alcohol is by the polymerization degree 500 that accounts for weight percentage 20%, the polyvinyl alcohol 0599 of alcoholysis degree 99% and 80% the polymerization degree 1700, the polyvinyl alcohol 1799 of alcoholysis degree 99% is formed) join together in the melting mixing equipment, at 180 ℃, mixing revolution 100rpm, mixing time 15min, preparation plasticised polyvinyl alcohol;
The plasticised polyvinyl alcohol that makes is joined in the melting mixing equipment with tapioca (flour) by weight ratio as coating material, under 170 ℃ temperature, mixing revolution 50-100rpm, mixing time 10min, carry out melt blending and prepare various starch based filling master batchs, wherein coating the shared weight percentage of material is 30%, and the shared weight percentage of W-Gum is 70%;
With the starch based filling master batch that makes and molecular weight is that 115000 lined polymethyl ethylene carbonate is after super mixer mixes, wherein, the shared weight percentage of starch based filling master batch is 40%, the shared weight percentage of lined polymethyl ethylene carbonate is 60%, join in the melting mixing equipment in above ratio, at 190 ℃, mixing revolution 80rpm, mixing time 5min carries out melt blending and prepares degradable composite material.
Embodiment 6
Be 20% softening agent with weight percentage---low polymerization degree polyoxyethylene glycol and weight percentage be 80% polyvinyl alcohol (wherein, polyvinyl alcohol is by the polymerization degree 500 that accounts for weight percentage 20%, the polyvinyl alcohol 0588 of alcoholysis degree 88% and 80% polymerization degree are 1700, alcoholysis degree is 88% polyvinyl alcohol 1788 compositions) join together in the melting mixing equipment, at 190 ℃, mixing revolution 100rpm, mixing time 10min, preparation plasticised polyvinyl alcohol;
The plasticised polyvinyl alcohol that makes is joined in the melting mixing equipment with tapioca (flour) by weight ratio as coating material, under 190 ℃ temperature, mixing revolution 100rpm, mixing time 10min, carry out melt blending and prepare various starch based filling master batchs, wherein coating the shared weight percentage of material is 20%, and the shared weight percentage of W-Gum is 80%;
With the starch based filling master batch that makes and molecular weight is that 40000 lined polymethyl ethylene carbonate is after super mixer mixes, wherein, the shared weight percentage of starch based filling master batch is 40%, the shared weight percentage of lined polymethyl ethylene carbonate is 60%, join in the melting mixing equipment in above ratio, at 190 ℃, mixing revolution 80rpm, mixing time 5min carries out melt blending and prepares degradable composite material.
The composition and performance of the multicomponent composite materials among the present invention is as shown in the table:
The composition of multicomponent composite materials and performance
| Embodiment | The starch based filling master batch, consumption weight % | The lined polymethyl ethylene carbonate number-average molecular weight, consumption weight % | Yield strength, MPa | Young's modulus, MPa |
| Matrix 1 | 1，0 | 40000，100 | 20.2 | 1065 |
| Matrix 2 | 1，0 | 56000，100 | 25.8 | 1265 |
| Matrix 3 | 1，0 | 90000，100 | 28.8 | 1665 |
| Matrix 4 | 1，0 | 115000，100 | 30.2 | 1965 |
| 1 | 1，20 | 40000，80 | 28.6 | 1720 |
| 2 | 1，40 | 40000，60 | 30.6 | 1841 |
| 3 | 2，40 | 40000，60 | 31.6 | 1860 |
| 4 | 2，40 | 56000，60 | 37.0 | 1900 |
| 5 | 2，40 | 90000，60 | 41.5 | 2007 |
| 6 | 2，40 | 115000，60 | 43.4 | 2260 |
| 7 | 2，60 | 56000，60 | 48.4 | 2207 |
| 8 | 2，80 | 56000，20 | 55.7 | 2317 |
| 9 | 2，90 | 56000，10 | 60.7 | 2417 |
| 10 | 3，40 | 56000，60 | 39.2 | 1900 |
| 11 | 4，40 | 56000，60 | 38.9 | 2080 |
| 12 | 5，40 | 56000，60 | 39.1 | 2040 |
| 13 | 6，40 | 56000，60 | 38.8 | 2060 |
| 14 | 7，40 | 56000，60 | 38.8 | 2080 |
| 15 | 8，40 | 56000，60 | 38.7 | 2100 |
| 16 | 9，40 | 56000，60 | 39.0 | 2140 |
| 17 | 10，40 | 56000，60 | 40.6 | 2210 |
| 18 | 11，40 | 56000，60 | 41.0 | 2250 |
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, as change to starch classification and softening agent, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1, a kind of polymer composites of multi-component totally degradable, it is characterized in that: such matrix material with the starch based filling master batch as filler, with the degradable lined polymethyl ethylene carbonate polymer is matrix, melt blending makes, wherein, the shared weight percentage of starch based filling master batch is 10-90%, and the weight percentage of lined polymethyl ethylene carbonate polymer is 90-10%.
2, the polymer composites of multi-component totally degradable according to claim 1, it is characterized in that: described filler is to adopt in advance that the plastifying polyvinyl alcohol coats the starch based filling master batch that various starch are made, the starch weight percentage is 70-80% in the starch based filling master batch, and the plasticised polyvinyl alcohol weight percentage is 20-30%.
3, the polymer composites of multi-component totally degradable according to claim 2 is characterized in that: the coating material of described starch based filling master batch is the plastifying polyvinyl alcohol, and the polyvinyl alcohol polymerization degree is 500-1700, and alcoholysis degree is 88%-99%.
4, the polymer composites of multi-component totally degradable according to claim 1, it is characterized in that: described matrix lined polymethyl ethylene carbonate polymer be by propylene oxide and carbonic acid gas alternating polymerization and product, its molecular-weight average is 20,000 to 200,000, its chemical structure is:
5, a kind of preparation method as the polymer composites of arbitrary described multi-component totally degradable among the claim 1-4 is characterized in that: adopt in advance the plastifying polyvinyl alcohol to coat various starch and make the starch based filling master batch; With the starch based filling master batch as filler, being matrix by carbonic acid gas and propylene oxide synthetic degradable lined polymethyl ethylene carbonate polymer, with the starch based filling master batch under 150-190 ℃ temperature, mixing time is 5-20 minute, melt blending makes; Wherein, the shared weight percentage of starch based filling master batch is 10-90%.
6, the preparation method of the polymer composites of multi-component totally degradable according to claim 5 is characterized in that: described starch is a kind of or its arbitrary combination in tapioca (flour), W-Gum, wheat starch, potato starch, green starch, modified tapioca starch, modified corn starch, modification wheat starch, modification potato starch or the modification green starch.
7, the preparation method of the polymer composites of multi-component totally degradable according to claim 6, it is characterized in that: the coating material polyvinyl alcohol of described starch based filling master batch is handled through plasticising, and used softening agent can be a kind of or its arbitrary combination in glycerine, ethylene glycol, low polymerization degree polyoxyethylene glycol, tributyl citrate, the acetyl tributyl citrate butyl ester.
8, the preparation method of the polymer composites of multi-component totally degradable according to claim 7, it is characterized in that: described filler is to adopt in advance that the plastifying polyvinyl alcohol coats the starch based filling master batch that various starch are made, the starch weight percentage is 70-80% in the starch based filling master batch, and the plasticised polyvinyl alcohol weight percentage is 20-30%
9, the preparation method of the polymer composites of multi-component totally degradable according to claim 8 is characterized in that: the shared weight percentage of described starch based filling master batch is preferably 40-80%.
10, the preparation method of the polymer composites of multi-component totally degradable according to claim 9 is characterized in that: described starch accounts for the 20-60% of matrix material gross weight.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103665447A (en) * | 2012-09-17 | 2014-03-26 | 嘉和绿色智财股份有限公司 | Bioplastic material as well as preparation method and composite plastic material thereof |
| CN103724667A (en) * | 2013-12-16 | 2014-04-16 | 梁凯 | Thermoplastic biodegradable material and preparation method thereof |
| CN104684971A (en) * | 2012-09-28 | 2015-06-03 | 丹麦技术大学 | Mechanically invisible polymer coatings |
| CN107118397A (en) * | 2017-05-02 | 2017-09-01 | 安徽鼎正包装材料有限公司 | A kind of fully-degradable starch/PVA plastics bait and its processing method |
| CN114507423A (en) * | 2022-03-09 | 2022-05-17 | 万华化学（宁波）有限公司 | Starch-based biodegradable PBAT modified material and preparation method thereof |
| CN114957956A (en) * | 2022-05-20 | 2022-08-30 | 山东金冠网具有限公司 | Degradable composite material and degradable grass-prevention cloth prepared from same |
| WO2023045888A1 (en) * | 2021-09-24 | 2023-03-30 | 山东联欣环保科技有限公司 | Carbon dioxide copolymer composition and preparation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1250045B (en) * | 1991-11-07 | 1995-03-30 | Butterfly Srl | PROCEDURE FOR THE PRODUCTION OF PLASTICIZED POLYVINYL ALCOHOL AND ITS USE FOR THE PREPARATION OF BIODEGRADABLE STARCH-BASED THERMOPLASTIC COMPOSITIONS. |
| CN1528811A (en) * | 2003-09-29 | 2004-09-15 | 中山大学 | Full-degradable-polymethyl ethylene carbonate/starch composite material and preparing method thereof |
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2007
- 2007-04-25 CN CN2007100543510A patent/CN101293994B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103665447A (en) * | 2012-09-17 | 2014-03-26 | 嘉和绿色智财股份有限公司 | Bioplastic material as well as preparation method and composite plastic material thereof |
| CN104684971A (en) * | 2012-09-28 | 2015-06-03 | 丹麦技术大学 | Mechanically invisible polymer coatings |
| CN103724667A (en) * | 2013-12-16 | 2014-04-16 | 梁凯 | Thermoplastic biodegradable material and preparation method thereof |
| CN107118397A (en) * | 2017-05-02 | 2017-09-01 | 安徽鼎正包装材料有限公司 | A kind of fully-degradable starch/PVA plastics bait and its processing method |
| WO2023045888A1 (en) * | 2021-09-24 | 2023-03-30 | 山东联欣环保科技有限公司 | Carbon dioxide copolymer composition and preparation method therefor |
| CN114507423A (en) * | 2022-03-09 | 2022-05-17 | 万华化学（宁波）有限公司 | Starch-based biodegradable PBAT modified material and preparation method thereof |
| CN114507423B (en) * | 2022-03-09 | 2023-10-17 | 万华化学（宁波）有限公司 | Starch-based biodegradable PBAT modified material and preparation method thereof |
| CN114957956A (en) * | 2022-05-20 | 2022-08-30 | 山东金冠网具有限公司 | Degradable composite material and degradable grass-prevention cloth prepared from same |
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